Steps
Go to the Create (or Edit) Contact Form page
In the left panel (called Available Fields) start typing the name of the
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Category field to search for it - DO NOT PRESS ENTER
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To speed up your filtering: use the filters to turn off the other types of
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fields so you’re only seeing List fields
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This will reduce the
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Dropdown fields available
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Press the green
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Add to Form buttonfor the List field you want to add
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It will appear on the right side
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Scroll to the bottom and press Save